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Which of the following is one of the effects of the high surface tensions of water? A)...
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c) Materials are not impeded as they pass through the surface.
Surface tension is a measure of the magnitude of cohesive forces operating within the liquid molecules, holding them together. For substances at ambient temperature and pressure, water has the highest surface tension with one exception – mercury.
High surface tension is manifested in its huge capillary action, so that large trees are fed water from their roots. It also helps minimize the surface area, so that a drop of water appears spherical in shape. Moreover, it impedes movement of objects as they pass through the surface.
Vapour pressure is a good measure of the total amount of vapour in the air above the surface of water. Lower the magnitude of cohesive forces (hence surface tension), higher will be the amount of water molecules releasing into air (hence vapour pressure) and vice versa.
Therefore, the correct answer will be the option B) Water has an unusually low vapor pressure.
Posted by llltkl on May 25, 2013 at 4:58 PM (Answer #1)
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